<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div {
			width: 200px;
			height: 400px;
			/*上边框写法*/
			border-top: 2px solid red;
			border-left: 1px solid green;
			border-right: 1px solid blue;
			border-bottom: 1px solid pink;
		}
		input {
			/*border-top: none;
			border-left: none;
			border-right: none;
			border-bottom: 1px dashed red;*/
			/*四个边框都去掉 先写大的，后写小的*/
			border: none;
			border-bottom: 1px dashed red;

		}
	</style>
</head>
<body>
	<div> </div>
	用户名: <input type="text" > <br>
	密码: <input type="text" >
</body>
</html>